CN108494466B - Full-duplex relay transmission method and system based on loop interference reconstruction cancellation - Google Patents
Full-duplex relay transmission method and system based on loop interference reconstruction cancellation Download PDFInfo
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Abstract
The invention belongs to the technical field of radio transmission, and discloses a full-duplex relay transmission method based on loop interference reconstruction cancellation, which comprises the following steps: estimating channel parameters; a source node modulates a source signal; the relay node forwards a transmitting signal of the source node; the destination node decodes the transmission signal of the receiving relay node. The invention overcomes the defect that the complexity of the relay node is increased because of processing the residual loop interference of the relay node in the prior art, has the advantage of simplifying the processing process of the relay node and reduces the complexity of the relay node; the orthogonal frequency division multiplexing without the cyclic prefix is utilized for signal transmission, and the loop interference is reconstructed and offset, so that the consumption of the cyclic prefix on system frequency spectrum resources is reduced, and the frequency spectrum utilization rate of the full-duplex relay cooperative communication system is further improved; the signal-to-interference-and-noise ratio of the receiving end of the target node is maximized under the condition that residual loop interference does not need to be further counteracted, and the reliability of the full-duplex relay cooperative communication system is improved.
Description
Technical Field
The invention belongs to the technical field of radio transmission, and particularly relates to a full-duplex relay transmission method based on loop interference reconstruction cancellation.
Background
Currently, the current state of the art commonly used in the industry is such that: in order to meet the increasing data transmission demand, the bandwidth required by signals in wireless communication is increasingly wider, and under the condition that the frequency band resources are increasingly tense, a scheme for improving the spectrum use efficiency needs to be researched. The cooperative communication system can obtain space diversity gain similar to the MIMO system by using idle nodes in the communication network as relay nodes for signal forwarding, and can be used for resisting multipath fading of wireless channels. The full-duplex technology can transmit and receive signals on the same frequency at the same time, so that the frequency spectrum utilization rate of a communication system can be greatly improved, but the full-duplex technology has a serious self-interference problem, which is a bottleneck problem limiting the development of the full-duplex technology. The full-duplex cooperative communication technology can improve the utilization rate and reliability of frequency spectrum resources of a wireless communication system, but the problem of influence of self-interference on the performance of the system must be solved. One of the prior art proposes a beamforming scheme for a full-duplex relay method. The method is used for a full-duplex amplification forwarding relay system, the relay eliminates loop self-interference of the relay by configuring a plurality of receiving antennas and transmitting antennas and utilizing beam forming, so that the signal-to-interference-and-noise ratio of the system is maximized. The method has the following defects: the full-duplex cooperative system utilizes the beam forming to eliminate the loop interference, the operation of the process is complex, the condition that a direct link exists in the system is not considered, and the full-duplex cooperative system is not suitable for the common scene that the direct link exists. The second prior art provides a communication method based on a full-duplex multi-relay system. The method comprises the following implementation steps: firstly, a signal source sends signals to all relay nodes; secondly, the relay node receives and decodes the received information source signal, performs loop cancellation on the loop signal by using an interference elimination technology, selects an optimal relay to forward the decoded information source signal to an information sink, and meanwhile, the information source continues to send the signal to the relay; and thirdly, the destination node recovers the information source signal forwarded by the relay node. The method has the following disadvantages: because an additional self-interference elimination technology is adopted in the full-duplex system to offset the loop interference, the processing time delay and the operation complexity of the relay node are increased.
In summary, the problems of the prior art are as follows:
(1) the beam forming scheme is used for the full duplex relay method, the process operation used for eliminating the loop interference by using the beam forming is complex, and the condition that a direct link exists in a system is not considered.
(2) In the communication method based on the full-duplex multi-relay system, the self-interference elimination technology is adopted in the full-duplex system to offset the loop interference, so that the processing time delay and the complexity of the relay node are increased.
The difficulty and significance for solving the technical problems are as follows: the full-duplex system has the problem that loop self-interference exists inevitably due to the fact that signals are transmitted and received at the same time and the same frequency, and the performance of the full-duplex system is severely limited by the existence of the loop self-interference. The existing interference elimination technology still cannot completely eliminate the loop self-interference, and the processing method for the residual loop self-interference affects the overall performance of the system. The prior art generally adopts additional techniques to directly perform interference cancellation, which undoubtedly adds additional operation and processing delay. If the residual self-interference can be processed properly, the full-duplex system can exert the superiority thereof, and high spectrum efficiency and capacity are realized.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a full-duplex relay transmission method based on loop interference reconstruction cancellation.
The invention is realized in this way, a full duplex relay transmission method based on the reconstruction and offset of the loop interference, the full duplex relay transmission method based on the reconstruction and offset of the loop interference constructs a channel with the residual loop interference between a source node and a destination node into an equivalent L (L represents the multipath length of a relay equivalent channel) path multipath channel, utilizes an Orthogonal Frequency Division Multiplexing (OFDM) transmission signal without a cyclic prefix, reconstructs and offsets the loop interference, and resists the residual loop interference passing through the loop channel of the relay node for less than L times; and amplifying the signals of the relay node loop channel for less than L times by using the optimal gain amplification factor, so that the residual loop interference passing through the relay node loop channel for more than L times is quickly attenuated.
Further, the full-duplex relay transmission method based on loop interference reconstruction cancellation comprises the following steps:
step one, estimating channel parameters: respectively obtaining channel coefficients h from a source node S to a relay node R by adopting a minimum mean square error channel estimation methodSRChannel coefficient h from relay node R to destination node DRDFrom source node S to destination nodeD channel coefficient hSDAnd the residual self-interference channel coefficient h of the relay node RLI；
Step two, the source node modulates the information source signal: the source node S modulates the information source signal by adopting Orthogonal Frequency Division Multiplexing (OFDM) to obtain a transmitting signal x and sends the transmitting signal x to the relay node R;
step three, the relay node forwards the transmitting signal x of the source node;
(1) the method comprises the steps that a relay node receives a transmitting signal of a source node through a receiving antenna, the relay node forwards the transmitting signal of the source node to a destination node through the transmitting antenna, and the receiving antenna of the relay node receives the transmitting signal of the source node and the transmitting signal of the source node forwarded by the relay node at the same time and the same frequency;
(2) calculating the optimal gain amplification factor of the relay node:
wherein, betaoptRepresents the relay node optimal gain amplification factor, beta represents the relay node amplification factor,
represents the value of beta when the beta is between 0 and 1, so that max (phi) takes the maximum value, | represents the solving of the parameter module value, hSRRepresenting the channel coefficient, h, from the source node S to the relay node RRDRepresenting the channel coefficient, h, from the relay node R to the destination node DLIRepresenting the residual self-interference channel coefficient of the relay node R, L representing the multipath length of the equivalent multipath channel, hSDRepresenting the channel coefficients from the source node S to the destination node D,
representing the noise variance of the relay node R,
representing the noise variance of the destination node D;
(3) constructing a channel coefficient matrix of an equivalent multipath channel of the relay node by using the optimal gain amplification factor of the relay node:
h＝[h(0),…,h(l),…,h(L-1)]；
wherein h (0) ═ hSD，h(l)＝hSRhRDβ(hLIβ)l-1(0 < L < L) represents the channel coefficient of the first path equivalent channel;
(4) the relay node R amplifies the transmitting signal x to obtain a transmitting signal t [ m ] of the mth time slot of the relay node:
wherein, x [ m-j ]]Transmitting signal representing the m-j time slot of the source node S, nR[m-j]A noise signal indicating an m-j-th time slot of the relay node R, j being 1,2, …, ∞;
step four, the destination node decodes and receives the transmitting signal of the relay node:
(1) the destination node D receives the transmitting signal t [ m ] of the relay node]Obtaining a received signal y, and performing loop interference reconstruction cancellation on the signal y to obtain a signal to be demodulated
(2) Destination node D demodulates its signal to be demodulated
And carrying out OFDM demodulation to obtain an information source signal sent by the source node S.
Further, the step (2) of calculating the optimal gain amplification factor β of the relay node specifically includes:
first, construct the equation:
wherein, gamma represents the calculation result, | · | represents the solving of the parameter modulus, hSRRepresenting a source node S to a relay nodeChannel coefficient of R, hRDRepresenting the channel coefficient from the relay node R to the destination node D, L representing the multipath length of the equivalent multipath channel, hSDRepresenting the channel coefficient, h, from the source node S to the destination node DLIRepresenting the remaining self-interference channel coefficients of the relay node R,
representing the variance of the noise at the destination node D,
represents the noise variance of the relay node R;
secondly, making a equal to 0 and b equal to 1;
the third step is to order
Substituting the obtained product into the first step to calculate gamma;
fourthly, judging whether gamma is equal to 0, if yes, executing the ninth step, and if not, executing the fifth step;
step five, judging whether a and b are equal, if so, executing the step nine, otherwise, executing the step six;
sixthly, judging whether gamma is larger than 0, if so, executing the seventh step, otherwise, executing the eighth step;
seventhly, enabling a to be beta, and executing the third step;
step eight, making b equal to beta, executing the step three;
and step nine, outputting beta.
Further, the loop interference reconstruction cancellation algorithm of step four (1) specifically includes:
first, estimating the channel by least squares
Setting I as 0 initially, and setting I as the current iteration times;
secondly, constructing an interference matrix C:
wherein, C(I)Representing the matrix resulting from the I-th estimation of the interference matrix C,
representing the channel coefficient of the I estimation of the first path equivalent channel, wherein L is more than 0 and less than L, and L represents the multipath length of the equivalent multipath channel;
thirdly, interference reconstruction offset of the received signal is carried out:
wherein the content of the first and second substances,
the signal after the ith symbol is received by the destination node and interference reconstruction cancellation is performed for I +1 times is shown,
signal representing the I-th symbol received by the destination node after I interference reconstruction cancellation, C(I)Representing the matrix resulting from the I-th estimation of the interference matrix C,
representing the i-1 st signal sequence after interference reconstruction cancellation and equalization of the destination node D,
indicating the ith signal sequence after I interference reconstruction cancellation and equalization is carried out on the destination node D;
step four, updating channel information:
wherein the content of the first and second substances,
representing the estimated channel coefficient of the I +1 th time of the l path equivalent channel;
fifthly, substituting the updated channel information into the second step, and enabling I to be I + 1;
sixthly, judging whether the I is more than the given iteration times, if so, executing the seventh step, otherwise, executing the second step;
step seven, outputting the signal to be demodulated of the destination node
Another object of the present invention is to provide a full duplex relay transmission method using the loop interference reconstruction cancellation.
In summary, the advantages and positive effects of the invention are:the invention constructs the channel with residual loop interference between the source node and the destination node into an equivalent L (L represents the multi-path length of the relay equivalent channel) path multi-path channel, utilizes orthogonal Frequency division multiplexing OFDM (orthogonal Frequency division multiplexing) transmission signal without cyclic prefix, reconstructs the loop interference to resist the residual loop interference passing through the relay node loop channel for less than L times, can eliminate the residual loop self-interference without additional operation, overcomes the defect that the complexity of the relay node is increased due to the processing of the residual loop interference of the relay node in the prior art, simplifies the processing process of the relay node, and reduces the complexity of the relay node. The invention uses the optimal gain amplification factor to amplify the signal of the relay node after the loop interference is removed, so that the residual loop interference passing through the loop channel of the relay node for more than L times is quickly attenuated, the defect that the relay node must further counteract the residual loop interference in the prior art is overcome, the invention has the advantage of maximizing the signal-to-interference-and-noise ratio of the receiving end of the target node under the condition of not further counteracting the residual loop interference, and the reliability of the full-duplex relay cooperative communication system is improved. The invention utilizes the orthogonal frequency division multiplexing without the cyclic prefix to resist the multipath, reduces the consumption of the cyclic prefix to the system frequency spectrum resource, and furtherThe frequency spectrum utilization rate of the full-duplex relay cooperative communication system is improved. The method for carrying out simultaneous co-frequency transmission on signals based on the orthogonal frequency division multiplexing OFDM without the cyclic prefix is provided for a full-duplex cooperative communication system, the processing process of the relay node on the residual loop interference can be simplified, the influence of the residual loop interference on the system performance is reduced, and the reliability and the frequency spectrum utilization rate of the full-duplex cooperative relay communication system are improved.
Drawings
Fig. 1 is a flowchart of a full-duplex relay transmission method based on loop interference reconstruction cancellation according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a full-duplex relay cooperative communication scenario provided in an embodiment of the present invention.
Fig. 3 is a flowchart of an implementation of a full-duplex relay transmission method based on loop interference reconstruction cancellation according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention relates to an Orthogonal Frequency Division Multiplexing (OFDM) simultaneous co-frequency full duplex relay method in the technical field of full duplex cooperative communication. The invention can be used for a distributed cooperative transmission system of future wireless mobile communication, and improves the reliability and the spectrum utilization rate of the cooperative communication system.
As shown in fig. 1, the full-duplex relay transmission method based on loop interference reconstruction cancellation provided in the embodiment of the present invention includes the following steps:
s101: estimating channel parameters;
s102: node modulating the information source signal;
s103: the relay node forwards a transmitting signal of the source node;
s104: the destination node decodes the transmission signal of the receiving relay node.
The application of the principles of the present invention will now be described in further detail with reference to the accompanying drawings.
As shown in fig. 2, the method of the present invention is implemented in the scenario of fig. 2. In fig. 2, a source node S, a destination node D and a relay node R are included. In fig. 2, a source node and a destination node are both equipped with one antenna, a relay node is equipped with two antennas, the source node transmits signals in a half-duplex mode, the destination node receives signals in the half-duplex mode, and the relay node receives and transmits signals in a full-duplex mode. H in FIG. 2SRRepresenting the channel parameter from the source node to the relay node, h in fig. 2LIIndicates the remaining loop interference channel parameter after the relay node adopts the interference cancellation technique, h in fig. 2RDIndicating the channel parameter from the relay node to the destination node, h in fig. 2SDRepresenting the channel parameters from the source node to the destination node. The source node sends a signal to the relay node in each time slot, and the relay node amplifies and forwards the received signal in an amplifying and forwarding mode. The destination node receives the signal forwarded by the relay node and can also receive a direct signal transmitted by the source node.
As shown in fig. 3, the implementation steps of the present invention for completing full-duplex relay cooperative communication are as follows:
step 1, estimating channel parameters.
And respectively estimating channel parameters from the source node to the relay node, channel parameters from the relay node to the destination node and relay node loop channel parameters by adopting a minimum mean square error channel estimation method.
And 2, modulating the information source signal by the source node.
And the source node modulates the information source signal by adopting an Orthogonal Frequency Division Multiplexing (OFDM) modulation method to obtain a transmitting signal and transmits the transmitting signal to the relay node.
And step 3, the relay node forwards the transmitting signal of the source node.
The relay node receiving antenna receives the transmitting signal of the source node, and forwards the transmitting signal of the source node to the destination node through the transmitting antenna, and meanwhile, the relay node receiving antenna receives the forwarded transmitting signal of the source node. The received signal expression of the relay node is as follows:
r[i]＝hSRx[i]+hLIt[i]+nR[i]；
wherein r [ i ]]Indicating the signal received by the relay node in the ith time slot, hSRRepresenting the channel parameter from the source node to the relay node, x [ i ]]Indicating the signal transmitted by the source node in the ith time slot, hLIRepresenting the relay node loop residual channel parameter, t [ i ]]Representing signals transmitted by the relay node in the ith time slot, nR[i]Representing the noise at the ith slot relay node.
Calculating the optimal gain amplification factor of the relay node according to the following formula:
wherein, betaoptRepresents the relay node optimal gain amplification factor, beta represents the relay node amplification factor,
represents the value of beta when the beta is between 0 and 1, so that max (phi) takes the maximum value, | represents the solving of the parameter module value, hSRRepresenting the channel coefficient, h, from the source node S to the relay node RRDRepresenting the channel coefficient, h, from the relay node R to the destination node DLIRepresenting the residual self-interference channel coefficient of the relay node R, L representing the multipath length of the equivalent multipath channel, hSDRepresenting the channel coefficients from the source node S to the destination node D,
representing the noise variance of the relay node R,
representing the noise variance of the destination node D.
The specific steps of calculating the optimal gain amplification factor beta of the relay node are as follows:
step 1, constructing an equation according to the following formula:
wherein, gamma represents the calculation result, | · | represents the solving of the parameter modulus, hSRRepresenting the channel coefficient, h, from the source node S to the relay node RRDRepresenting the channel coefficient from the relay node R to the destination node D, L representing the multipath length of the equivalent multipath channel, hSDRepresenting the channel coefficient, h, from the source node S to the destination node DLIRepresenting the remaining self-interference channel coefficients of the relay node R,
representing the variance of the noise at the destination node D,
representing the noise variance of the relay node R.
Step 2, making a equal to 0 and b equal to 1;
step 3, order
Substituting the obtained product into the step 1 to calculate gamma;
step 4, judging whether gamma is equal to 0, if yes, executing step 9, and if not, executing step 5;
step 5, judging whether a and b are equal, if so, executing step 9, otherwise, executing step 6;
step 6, judging whether gamma is larger than 0, if so, executing the step 7, otherwise, executing the step 8;
step 7, making a equal to beta, and executing step 3;
step 8, making b equal to beta, and executing step 3;
and 9, outputting beta.
The relay node R amplifies the transmitting signal x to obtain a transmitting signal t [ m ] of the mth time slot of the relay node:
wherein, x [ m-j ]]Transmitting information for representing m-j time slot of source node SNumber nR[m-j]And j is 1,2, …, ∞, which represents the m-j time slot of the relay node R.
And 4, decoding and receiving the transmitting signal of the relay node by the destination node.
The destination node D receives the transmitting signal t [ m ] of the relay node]Obtaining a received signal y, and performing loop interference reconstruction cancellation on the signal y to obtain a signal to be demodulated
The specific steps of the loop interference reconstruction cancellation algorithm are as follows:
step 1, estimating channel by least square method
Setting I as 0 initially, and setting I as the current iteration times;
step 2, constructing an interference matrix C according to the following formula:
wherein, C(I)Representing a matrix obtained by the I estimation of the interference matrix C;
and 3, performing interference reconstruction cancellation on the received signal according to the following formula:
wherein the content of the first and second substances,
the signal after the ith symbol is received by the destination node and interference reconstruction cancellation is performed for I +1 times is shown,
signal representing the I-th symbol received by the destination node after I interference reconstruction cancellation, C(I)Representing the I-th estimate of the interference matrix CThe matrix obtained is then used as a basis,
representing the i-1 st signal sequence after interference reconstruction cancellation and equalization of the destination node D,
indicating the ith signal sequence after I interference reconstruction cancellation and equalization is carried out on the destination node D;
and step 4, updating the channel information according to the following formula:
wherein the content of the first and second substances,
represents the estimated channel coefficient of the I +1 th time of the l path equivalent channel,
the estimated channel coefficient of the I-th channel of the first-path equivalent channel is represented, L is more than or equal to 0 and less than L, and L represents the multipath length of the equivalent multipath channel;
step 5, substituting the updated channel information into the step 2, and enabling I to be I + 1;
step 6, judging whether I is larger than the given iteration times, if so, executing step 7, otherwise, executing step 2;
step 7, outputting the signal to be demodulated of the destination node
Destination node D demodulates its signal to be demodulated
And carrying out OFDM demodulation to obtain an information source signal sent by the source node S.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. A full duplex relay transmission method based on loop interference reconstruction and cancellation is characterized in that the full duplex relay transmission method based on loop interference reconstruction and cancellation constructs a channel with residual loop interference between a source node and a destination node into an equivalent L-path multipath channel, wherein L represents the multipath length of a relay equivalent channel; utilizing an Orthogonal Frequency Division Multiplexing (OFDM) transmission signal without a cyclic prefix, and reconstructing and offsetting loop interference to resist the residual loop interference passing through a relay node loop channel for less than L times; amplifying signals of the relay node equivalent loop channel for less than L times by using the optimal gain amplification factor, so that the residual loop interference passing through the relay node equivalent loop channel for more than L times is quickly attenuated;
the full-duplex relay transmission method based on loop interference reconstruction cancellation comprises the following steps:
step one, estimating channel parameters: respectively obtaining channel coefficients h from a source node S to a relay node R by adopting a minimum mean square error channel estimation methodSRChannel coefficient h from relay node R to destination node DRDChannel coefficient h from source node S to destination node DSDAnd the residual self-interference channel coefficient h of the relay node RLI；
Step two, the source node modulates the information source signal: the source node S modulates the information source signal by adopting Orthogonal Frequency Division Multiplexing (OFDM) to obtain a transmitting signal x and sends the transmitting signal x to the relay node R;
step three, the relay node forwards the transmitting signal x of the source node;
(1) the method comprises the steps that a relay node receives a transmitting signal of a source node through a receiving antenna, the relay node forwards the transmitting signal of the source node to a destination node through the transmitting antenna, and the receiving antenna of the relay node receives the transmitting signal of the source node and the transmitting signal of the source node forwarded by the relay node at the same time and the same frequency;
(2) calculating the optimal gain amplification factor of the relay node:
wherein, betaoptRepresents the relay node optimal gain amplification factor, beta represents the relay node amplification factor,
represents the value of beta when the beta is between 0 and 1, so that max (phi) takes the maximum value, | represents the solving of the parameter module value, hSRRepresenting the channel coefficient, h, from the source node S to the relay node RRDRepresenting the channel coefficient, h, from the relay node R to the destination node DLIRepresenting the residual self-interference channel coefficient of the relay node R, L representing the multipath length of the relay equivalent channel, hSDRepresenting the channel coefficients from the source node S to the destination node D,
representing the noise variance of the relay node R,
representing the noise variance of the destination node D;
(3) constructing a channel coefficient matrix of an equivalent multipath channel of the relay node by using the optimal gain amplification factor of the relay node:
h＝[h(0),…,h(l),…,h(L-1)]；
wherein h (0) ═ hSD，h(l)＝hSRhRDβ(hLIβ)l-1(0 < L < L) represents the channel coefficient of the equivalent channel of the first path system;
(4) the relay node R amplifies the transmitting signal x to obtain a transmitting signal t [ m ] of the mth time slot of the relay node:
wherein, x [ m-j ]]When representing the m-j of the source node STransmission signal of slot, nR[m-j]A noise signal indicating an m-j-th time slot of the relay node R, j being 1,2, …, ∞;
step four, the destination node decodes and receives the transmitting signal of the relay node:
(1) the destination node D receives the transmitting signal t [ m ] of the relay node]Obtaining a received signal y, and performing loop interference reconstruction cancellation on the signal y to obtain a signal to be demodulated
(2) Destination node D demodulates its signal to be demodulated
And carrying out OFDM demodulation to obtain an information source signal sent by the source node S.
2. The full-duplex relay transmission method based on loop interference reconstruction cancellation according to claim 1, wherein in step three (2), the optimal gain amplification factor β of the relay node is calculatedoptThe method specifically comprises the following steps:
first, construct the equation:
wherein γ represents a calculation result;
secondly, making a equal to 0 and b equal to 1;
the third step is to order
Substituting the obtained product into the first step to calculate gamma;
fourthly, judging whether gamma is equal to 0, if yes, executing the ninth step, and if not, executing the fifth step;
step five, judging whether a and b are equal, if so, executing the step nine, otherwise, executing the step six;
sixthly, judging whether gamma is larger than 0, if so, executing the seventh step, otherwise, executing the eighth step;
seventhly, enabling a to be beta, and executing the third step;
step eight, making b equal to beta, executing the step three;
and step nine, outputting beta.
3. The full-duplex relay transmission method based on loop interference reconstruction cancellation according to claim 1, wherein the loop interference reconstruction cancellation algorithm of step four (1) specifically includes:
first, estimating the channel by least squares
Setting I as 0 initially, and setting I as the current iteration times;
secondly, constructing an interference matrix C:
wherein, C(I)Representing the matrix resulting from the I-th estimation of the interference matrix C,
representing the channel coefficient of the I estimation of the first path equivalent channel, wherein L is more than 0 and less than L, and L represents the multipath length of the equivalent multipath channel;
thirdly, interference reconstruction offset of the received signal is carried out:
wherein the content of the first and second substances,
the signal after the ith symbol is received by the destination node and interference reconstruction cancellation is performed for I +1 times is shown,
signal representing the I-th symbol received by the destination node after I interference reconstruction cancellation, C(I)Representing the matrix resulting from the I-th estimation of the interference matrix C,
representing the i-1 st signal sequence after interference reconstruction cancellation and equalization of the destination node D,
indicating the ith signal sequence after I interference reconstruction cancellation and equalization is carried out on the destination node D;
step four, updating channel information:
wherein the content of the first and second substances,
representing the estimated channel coefficient of the I +1 th time of the l path equivalent channel;
fifthly, substituting the updated channel information into the second step, and enabling I to be I + 1;
sixthly, judging whether the I is more than the given iteration times, if so, executing the seventh step, otherwise, executing the second step;
step seven, outputting the signal to be demodulated of the destination node
4. A wireless mobile communication system applying the full-duplex relay transmission method based on loop interference reconstruction and cancellation according to any one of claims 1 to 3.
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